2.5Gbps Laser Driver with Automatic

Modulation Control

4

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50

Ω

DATA-

DATA-

50

Ω

DATA+

DATA+

50

Ω

CLK+-

CLK+

50

Ω

CLK-

CLK-

PATTERN GENERATOR

MAX3865

RTEN

GND

EN1

EN0

MODN

MODQ

BIAS

BIAS_X

33

Ω

50

Ω

33

Ω

50

Ω

0.1

µF

0.1

µF

OSCILLOSCOPE

Figure 1. Test Circuit

CLK+

CLK-

DATA+

DATA-

(DATA+) - (DATA-)

5mA–60mA

1.3V

1.3V

0.1V–0.8V

0.1V–0.8V

Figure 2. Required Input Signal, Setup/Hold-Time Definition, and Output Polarity